package com.atguigu.gulimall.order.config;

import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

/**
 * feign拦截器功能(在远程请求时携带认证信息cookie)
 *
 * @author: kaiyi
 * @create: 2020-09-14 14:26
 */
@Configuration
public class GuliFeignConfig {

  @Bean("requestInterceptor")
  public RequestInterceptor requestInterceptor() {

    RequestInterceptor requestInterceptor = new RequestInterceptor() {
      @Override
      public void apply(RequestTemplate template) {
        //1、使用RequestContextHolder拿到刚进来的请求数据
        ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();

        if (requestAttributes != null) {
          //老请求,携带了cookie
          HttpServletRequest request = requestAttributes.getRequest();

          if (request != null) {
            //2、同步请求头的数据（主要是cookie）
            //把老请求的cookie值放到新请求上来，进行一个同步
            String cookie = request.getHeader("Cookie");

            // 给新请求同步了老请求的cookie
            template.header("Cookie", cookie);
          }
        }
      }
    };

    return requestInterceptor;
  }

}
